Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21372c2ba2beb5c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 09:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02657693df533c560d406699d237fe77 SHA-1: 03745e950208d09f57249b6fa75f0184fb74e7fe SHA-256: a21372c2ba2beb5c7ac310f161cf3820c7115c6e3c68f23e5797e3f18e9b46b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish for information. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=free+fire+booyah+apk+download PDF link annotation
    • http://climtech.com/files/files/letemebagemid.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/pilederadetopagubidewoz.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/roxisuteguwamibebutuwaw.pdfIn PDF document text
    • http://scro.ru/pic/file/kemumilumiluxugazukofu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/55968814854.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210914_3CC169FBC9687B2C.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/tigiwegikiw.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/85118616448.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/6965205308.pdfIn PDF document text
    • https://maria-galland.ru/files/file/regomovel.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/gubavedixub.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe88f6c71f---72229621992.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/mokufadabewesiwobu.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/rataf.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131731417206.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16320527378072.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/45413868676.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c06f595ea---wofizovulotofulul.pdfIn PDF document text
    • http://unsersohn.ch/images/file/40968827972.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/47465933410.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29514823773.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/42528796192.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-01-26-01-28.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/29eg9ou3vi2oga0foekp8p37t7/jasovuvobuzapinoralox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 18016 bytes
SHA-256: 31fe0be0ecfd355dbec2830be43b295d0da367c42c19ed8233ec67536c9adba1
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10740 bytes
SHA-256: ed5b99ecb6da9eb1e00d2a7d39e4d9558b6c5f470a8cbd1e1294f40b17f9350e
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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